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General Discussion

A place to talk about whatever you want

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A

Why does HLS 5 GMAC mutual authentication fail in reply_to_HLS_authentication (Action-Request) due to Green Book AAD construction and Invocation Counter endianness?

dlms cosem hls5 gmac securitysuite1 alex_turner

239 57 9
M

Why does Class 7 Profile Generic Selective Access Range Descriptor trigger Data-Access-Result 2 (hardware-fault) on 12-byte Date-Time Deviation and Column Index misalignments?

dlms cosem profilegeneric selectiveaccess rangedescriptor marcus_vance

241 58 9
C

Dynamic Rolling Single-Action Schedules vs Firmware OTA: Ingenious Workaround or Field Maintenance Nightmare?

dlms cosem class-22 class-10 architecture carlos_mendez

180 50 6
C

Why does Disconnect Control (Class 70) Method 2 return Success (0x00) while output_state remains false?

dlms cosem class-70 relaycontrol fieldtriage carlos_mendez

142 46 4
S

Dual Single Action Schedule (Class 22) vs Unified Schedule Table (Class 10): Practical Workaround or OBIS Misuse?

dlms cosem class-10 class-22 obis sarah_jenkins

126 38 4
M

Is Class 9 (Script Table) Dynamic Behavior Orchestration a Security Vulnerability or an Advanced Edge Feature?

dlms cosem class-9 class-70 security marcus_vance

142 46 4
C

Why does Class 22 Single Action Schedule (0.0.15.0.1.255) return read-write-denied on multi-element execution_time arrays?

dlms cosem class-22 class-9 class-70 carlos_mendez

138 44 4
D

Why does DLMS Security Suite 1 (HLS 7 / ECDSA P-256) ignite debate over MCU computational overhead vs zero-trust PKI scalability?

debate hls7 ecdsa dlms cryptography david_miller

336 98 10
D

What are the bandwidth and verification trade-offs between raw A-XDR hex payloads and edge JSON translation in DLMS MQTT gateways?

mqtt coap dlmspush iot serialization david_miller

124 37 4
C

What are the mapping models and concurrency architectures for translating IEC 60870-5-104 telecontrol to DLMS/COSEM?

iec104 telecontrol gateway dlms distributionaut carlos_mendez

120 35 4
M

How to optimize DLMS Compact Profile and Short Name addressing over Wireless M-Bus (EN 13757) for 15-year battery life?

wirelessm-bus lowpower watergasmeters framecompressio en13757 marcus_vance

98 24 4
E

How do architectural differences between Modbus RTU and DLMS/COSEM shape protocol selection in IoT gateways?

protocolcompari modbus dlms gateway elena_rostova

94 22 4
M

What are the common failure modes and cost considerations during official DLMS CTT certification?

dlms export testing conformance iec62056 marcus_vance

86 18 4
E

What is the biggest conceptual culture shock when transitioning from Modbus/DNP3 to DLMS/COSEM?

modbus dlms protocolcompari architecture discussion elena_rostova

82 16 4
C

What essential field debugging tools and hardware isolators do engineers carry for substation DLMS captures?

fieldengineerin hardwaretools troubleshooting substation rs485 carlos_mendez

84 17 4
M

How to implement a minimal 20-line Python script to read active energy OBIS 1.0.1.8.0.255 via Gurux?

python gurux codesnippet obis tutorial marcus_vance

69 17 3
C

What is the standard intuitive structure of OBIS 6-tuple codes (A.B.C.D.E.F) in Blue Book?

beginner obis bluebook cosem iec62056-62 carlos_mendez

71 18 3
C

Why does sending SNRM frame 7E A0 0A... result in timeout with no response over optical probe?

beginner hdlc snrm opticalprobe iec62056-46 carlos_mendez

63 14 3
S

Why does signed 8-bit negative scaler (-3) cause 10^253 overflow and float32 rounding errors in smart metering billing?

dlms cosem scaler-unit class-3 data-precision sarah_jenkins

236 48 10
M

Why do meters reject fresh DLMS connections after TCP keep-alive disconnects with frame-counter-out-of-sequence?

dlms cosem invocation-coun anti-replay security-suite marcus_vance

226 43 10

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